Vega VEGAMET 391, Руководство по эксплуатации, Страница: 45 / 68

T
he sequence cannot be changed
,
the relay with the lowest index is
switched on
fi
rst
,
the the relay with the next higher index
. A
fter the
relay with the highest index
,
it is returned to the relay with the lowest
index
,
for example
R
el
.
1
- > R
el
.
2
- > R
el
.
3
- > R
el
.
4
- > R
el
.
1
- > R
el
.
2
… T
he sequence applies only to those relays assigned to the pump
control
.
I
n a waste water disposal system
,
a sump should be pumped empty
when a certain level is reached
. T
hree pumps are available for this
. A
t
60
%
level
,
pump
1
should run until the level has fallen below
10
%
. I
f
the
60
%
point is exceeded again
,
the same task is transferred to
pump
2
. I
n the third cycle
,
pump
3
is activated
;
after that
,
pump
1
again
. I
f the level continues to rise despite operation of a pump
,
an
additional pump switched on when the level exceeds the
75
%
switching point
. A
nd if the level still rises further due to extreme in
fl
ow
and exceeds the
90
%
limit
,
pump
3
is also switched on
.
S
elect in the
DTM
navigation section the menu items
" M eas . loop -
O utputs - R elay " .
l
S
et mode
" P ump control
4
"
for relays
1
…
3
.
l
E
nter the switching points for the concerned relays as follows
:
-
R
elay
1
upper switching point
=
60
.
0
%
-
R
elay 1 lower switching point
=
10
.
0
%
-
R
elay 2 upper switching point
=
75
.
0
%
-
R
elay
2
lower switching point
=
10
.
0
%
-
R
elay
3
upper switching point
=
90
.
0
%
-
R
elay
3
lower switching point
=
10
.
0
%
T
he function of the pump control
4
is shown in detail in the following
diagram
. T
he previously described example is used as a basis
.
Rel. 1: 60% On
Rel. 1..3: 10% Off
Rel. 2: 75% On
Rel. 3: 90% On
t(h)
Rel. 3
Rel. no.
Rel. 2
1 2 3 1 2 3 1 2 3 1 2
Rel. 1
F ig . 13 : E xample of a pump control 4
I
f all pumps have the same capacity and are used for the same task
alternately
,
the running time should always be roughly the same
. T
he
respective operating hours are summed up individually in the signal
conditioning instrument and can be read out in the menu
"
D
iagnose
–
E
xample
S etup
D iagnosis via running
time
VEGAMET
391
•
4
…
20
m
A / HART
signal conditioning instrument
45
8
A
pplication examples
36032
-
EN
-
091116